1329685856 has 12 divisors (see below), whose sum is σ = 2617819092. Its totient is φ = 664842912.

The previous prime is 1329685837. The next prime is 1329685879. The reversal of 1329685856 is 6585869231.

It is a junction number, because it is equal to n+sod(n) for n = 1329685798 and 1329685807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20776310 + ... + 20776373.

It is an arithmetic number, because the mean of its divisors is an integer number (218151591).

Almost surely, 2^1329685856 is an apocalyptic number.

1329685856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1329685856 is a deficient number, since it is larger than the sum of its proper divisors (1288133236).

1329685856 is an equidigital number, since it uses as much as digits as its factorization.

1329685856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41552693 (or 41552685 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 53.

The square root of 1329685856 is about 36464.8578222924. The cubic root of 1329685856 is about 1099.6378576480.

The spelling of 1329685856 in words is "one billion, three hundred twenty-nine million, six hundred eighty-five thousand, eight hundred fifty-six".